Network Router User Manual

42-88
Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
OL-4266-08
Chapter 42 Configuring PFC QoS
Configuring PFC QoS
When configuring a DSCP markdown map, note the following information:
• You can enter the normal-burst keyword to configure the markdown map used by the
exceed-action policed-dscp-transmit keywords.
• You can enter the max-burst keyword to configure the markdown map used by the violate-action
policed-dscp-transmit keywords.
Note When you create a policer that does not use the pir keyword, and the maximum_burst_bytes
parameter is equal to the normal_burst_bytes parameter (which occurs if you do not enter
the maximum_burst_bytes parameter), the exceed-action policed-dscp-transmit keywords
cause PFC QoS to mark traffic down as defined by the policed-dscp max-burst markdown
map.
• To avoid out-of-sequence packets, configure the markdown maps so that conforming and
nonconforming traffic uses the same queue.
• You can enter up to 8 DSCP values that map to a marked-down DSCP value.
• You can enter multiple commands to map additional DSCP values to a marked-down DSCP value.
• You can enter a separate command for each marked-down DSCP value.
Note Configure marked-down DSCP values that map to CoS values consistent with the markdown penalty.
This example shows how to map DSCP 1 to marked-down DSCP value 0:
Router# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)# mls qos map policed-dscp normal-burst 1 to 0
Router(config)# end
Router#
This example shows how to verify the configuration:
Router# show mls qos map
Normal Burst Policed-dscp map: (dscp= d1d2)
d1 : d2 0 1 2 3 4 5 6 7 8 9
-------------------------------------
0 : 00 01 02 03 04 05 06 07 08 09
1 : 10 11 12 13 14 15 16 17 18 19
2 : 20 21 22 23 24 25 26 27 28 29
3 : 30 31 32 33 34 35 36 37 38 39
4 : 40 41 42 43 44 45 46 47 48 49
5 : 50 51 52 53 54 55 56 57 58 59
6 : 60 61 62 63
Step 2
Router(config)# end
Exits configuration mode.
Step 3
Router# show mls qos maps
Verifies the configuration.
Command Purpose